NDLI: Physical processes contributing to the water mass transformation of the Indonesian Throughflow

Content Provider	Springer Nature Link
Author	Koch Larrouy, Ariane Madec, Gurvan Iudicone, Daniele Atmadipoera, Agus Molcard, Robert
Copyright Year	2008
Abstract	The properties of the waters that move from the Pacific to the Indian Ocean via passages in the Indonesian archipelago are observed to vary with along-flow-path distance. We study an ocean model of the Indonesian Seas with reference to the observed water property distributions and diagnose the mechanisms and magnitude of the water mass transformations using a thermodynamical methodology. This model includes a key parameterization of mixing due to baroclinic tidal dissipation and simulates realistic water property distributions in all of the seas within the archipelago. A combination of air–sea forcing and mixing is found to significantly change the character of the Indonesian Throughflow (ITF). Around 6 Sv (approximately 1/3 the model net ITF transport) of the flow leaves the Indonesian Seas with reduced density. Mixing transforms both the intermediate depth waters (transforming 4.3 Sv to lighter density) and the surface waters (made denser despite the buoyancy input by air–sea exchange, net transformation = 2 Sv). The intermediate transformation to lighter waters suggests that the Indonesian transformation contributes significantly to the upwelling of cold water in the global conveyor belt. The mixing induced by the wind is not driving the transformation. In contrast, the baroclinic tides have a major role in this transformation. In particular, they are the only source of energy acting on the thermocline and are responsible for creating the homostad thermocline water, a characteristic of the Indonesian outflow water. Furthermore, they cool the sea surface temperature by between 0.6 and 1.5°C, and thus allow the ocean to absorb more heat from the atmosphere. The additional heat imprints its characteristics into the thermocline. The Indonesian Seas cannot only be seen as a region of water mass transformation (in the sense of only transforming water masses in its interior) but also as a region of water mass formation (as it modifies the heat flux and induced more buoyancy flux). This analysis is complemented with a series of companion numerical experiments using different representations of the mixing and advection schemes. All the different schemes diagnose a lack of significant lateral mixing in the transformation.
Starting Page	275
Ending Page	288
Page Count	14
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	58
Issue Number	3-4
e-ISSN	16167228
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-10-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Indonesian Throughflow Water mass transformation Neutral density framework Thermodynamic Tidal mixing processes Environmental Monitoring/Analysis Fluids Geophysics/Geodesy Meteorology/Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Water mass transformation along the Indonesian throughflow in an OGCM

Interactions between tides and other frequencies in the Indonesian seas

Generation of overtides and compound tides in Amazon estuary

On the influence of stratification and tidal forcing upon mixing in sill regions

Interactions of river discharge and tidal modulation in a tropical estuary, NE Brazil

Impact of tidal mixing with different scales of bottom roughness on the general circulation

A multigrid methodology for assimilation of measurements into regional tidal models

Tidal-driven dynamics and mixing processes in a coastal ocean model with wetting and drying

Tidal mixing in the Indonesian Seas and its effect on the tropical climate system

Physical processes contributing to the water mass transformation of the Indonesian Throughflow

Similar Documents

Water mass transformation along the Indonesian throughflow in an OGCM

Interactions between tides and other frequencies in the Indonesian seas

Generation of overtides and compound tides in Amazon estuary

On the influence of stratification and tidal forcing upon mixing in sill regions

Interactions of river discharge and tidal modulation in a tropical estuary, NE Brazil

Impact of tidal mixing with different scales of bottom roughness on the general circulation

A multigrid methodology for assimilation of measurements into regional tidal models

Tidal-driven dynamics and mixing processes in a coastal ocean model with wetting and drying

Tidal mixing in the Indonesian Seas and its effect on the tropical climate system

Physical processes contributing to the water mass transformation of the Indonesian Throughflow